Company XYZ know that replacement times for the quartz time pieces it produces are normally distributed with a mean of 1

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Company Xyz Know That Replacement Times For The Quartz Time Pieces It Produces Are Normally Distributed With A Mean Of 1 1 (31.3 KiB) Viewed 48 times

Company XYZ know that replacement times for the quartz time pieces it produces are normally distributed with a mean of 15.4 years and a standard deviation of 2.5 years. Find the probability that a randomly selected quartz time piece will have a replacement time less than 7.7 years? P(X<7.7 years) - Enter your answer accurate to 4 decimal places. Answers obtained using exact z-scores or z-scores rounded to 3 decimal places are accepted. If the company wants to provide a warranty so that only 2.6 % of the quartz time pieces will be replaced before the warranty expires, what is the time length of the warranty? warranty - years. Enter your answer as a number accurate to 1 decimal place. Answers obtained using exact z-scores or z- scores rounded to 3 decimal places are accepted.